What gravel is best for driveways?

Usually some type of crushed gravel is best. You will want crushed jagged pieces of stone because they will compact better to form a seemingly solid surface. Avoid pea gravel or any ornamental rounded gravel as it will never compact, and will remain mushy allowing your cars tires to sink in. if you're going right down on soil some bigger Baseball sized rocks can go down first, then use a smaller rock (inch to half inch) at the surface. the type of rock will vary as your local supplier will predominately have what is most available in your region.